Nut-lock.



PATENTED SEPT 11 A. H. KNOPF.

NUT LOCK. APPLICATION FILED MAB..21. 1906.

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UNITED STATES PATENT OFFICE.

ALBERTH. KNOPF, OF OAK HALL, PENNSYLVANIA.

NUT-LOCK.

fie. 831,009.

Specification of Letters Patent.

Patented Sept. 11, 1906.

Application filed March 21, 19 O6. Serial No. 307.192.

been to form the bolt at different portions of its length of different sizes diametrically and to provide these different-sized port-ions with reversely-inclined or right-hand and lefthand screw-threads, so as to adapt them to nuts made internally of sizes corresponding to them and furnished with screw-threads adapted to engage with them. This way is objectionable, because, owing to the fact that the nuts need to be located at the junction of the two different-sized portions of the bolt less range in the adjustment of the nuts is afforded thanis desirable and also the bolt' is weakened by such reduction of its diameter at its outer end. The other way has been to form two reverscly-inclined threads upon one and the sameportion of the bolt. This latter way is objectionable because of the difficulty of properly forming the threads, and, moreover, because 'the intersection of the threads entails the removal of so much of each thread as to materially-weaken it.

The object of my invention is to produce a nutlock of such-character that the nuts may be turned in reverse directions to screw them upon the bolt without forming the bolt with reversely-inclined portions the outer one of which is of less diameter than the inner one or without forming a single portion of a bolt with reversely-inclined threads.

My invention consists in a bolt made in two pieces each piece being provided with threads reversely inclined to those of the other piece, and a nut or nuts havin threads adapted to receive and interfit with the reversely-inclined threads of the two-piece bolt.

I will now describe my invention so that others skilled in the art may manufacture and use the same, reference being had to the accompanying drawings, forming part of this specification, in which Figure 1 is a central longitudinal section 0 my invention. Fig. 2 is a similar view showing the two-piece bolt in full lines. Fig. 3 is aside elevation with the outer nut detached.

.Like symbols of reference indicate like parts in each figure.

In the drawings, 2 indicates the bolt proper provided at its end with a right-hand screwthreaded portion 3. Into the outer end of this portion 3 is screwed, by means ofa projccting end 4, a second portion 5 of the bolt,

which is provided on its outer surface with left-hand screw-threads 6.

7' is a nut provided in its smaller bore with right-hand screw-threads to adapt it to be screwed upon the right-hand screw-threaded portion 3 of the bolt. At its outer side the nut 7 is provided with an enlarged bore 8, tapped with left-hand screwthreads.

9 is a nut tapped internally with left-hand screw-threads adapted to screw upon the left-hand screw-threads of the end 5 of the bolt and having also a projection or extension 10, provided with external left-handy screw-threads 11, adapted to screw into the enlarged bore 8 of the nut 7. The end 5 is provided with a recess 12 for engagement therewith of any suitable tightening implement.

The manner of assembling the several parts above described is as follows, viz: The nut 7 is first screwed on the bolt 2, its smaller riglit hand-threaded bore screwing onto, the righthand-threaded portion 3 of the bolt. The projection 1 of the left-hand-threaded portion 5 of the bolt is now screwed into the end 3 until the two portions 3 and 5 of the bolt are brought flush together. The nutv 9 is now screwed onto the end 5, its screwthreaded portion or extension 10 engaging the screw-threads of the larger bore 8 of the nut 7. When the parts are thus tightly assembled they are securely held against movement or displacement.

I claim 1. In a nut-lock, the combination of a bolt formed in two parts, one of said parts having a projection extending from one end and screwed into a recess in the other, so as to cause the ends of the two sections of the bolt to abut against each other and each of said parts being provided with screw-threads reversely inclined to those of the other part; and nuts having screw-threads adapted to engage the screw-threads of the said two parts; substantially as described.

2. In a nut-lock, the combination of a bolt IIO formed in two parts of equal diameter, one of said parts having a projection screwed into a recess in the other, and each of said parts being provided with screw-threads reversely inclined to those of the other parts; and nuts having screw-threads adapted to engage the screw-threads of the said two parts; substantially as described.

3.- In a nut-lock, the combination of a'bolt formed in two parts, one of said parts having a projection extending from one end and screwing into a recess in the other; so as to cause the ends of the two sections of the bolt to abut against each other and each of said parts being provided with screw-threads reversely inclined to those of the other part; and nuts having screw-threads adapted to engage the screw-threads of said two parts of the bolt, the'inner of said nuts having an enlarged screw-threaded bore adapted to receive a screw-threaded extension of the outer nut; substantially as described.

In testimony whereof I have hereunto set my hand.

ALBERT H. KNOPF. Witnesses:

I'IEXRY LOWRY. 

